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Rafael Coll,

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Basic Electrical Safety Rafael Coll, Environment Safety and Health Section Health& Safety Group Ext. 8518 Pager: (630) 266-6103 Basic Electrical Safety – PowerPoint PPT presentation

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Title: Rafael Coll,


1
Basic Electrical Safety
Rafael Coll, Environment Safety and Health
Section Health Safety Group Ext. 8518 Pager
(630) 266-6103
2
Basic Electrical Safety
? Course not designed to teach you to work on
electrical equipment.
? You will not be qualified to work
on electrical equipment.
? If you spot problems with electrical equipment
you should report it to your supervisor.
3
Objectives
  • Be familiar with the fundamental concepts of
    electricity.
  • Be familiar with the effects of electricity on
    the human body.
  • Be able to recognize common electrical
  • hazards.

4
Objectives
  • Be familiar with electrical protective devices.

5
Fundamentals of Electrical Hazards
  • To flow electricity must have a complete path.
  • Electricity flows through conductors
  • water, metal, the human body
  • Insulators are non-conductors
  • The human body is a conductor.

6
Fundamentals of Electrical Hazards
Have You Ever Been Shocked?
THE BASICS
7
Fundamentals of Electrical Hazards
? More than 3 ma painful shock ? More than 10
ma muscle contraction no-let-go danger ? More
than 30 ma lung paralysis- usually
temporary ? More than 50 ma possible ventricular
fib. (heart dysfunction, usually fatal) ? 100 ma
to 4 amps certain ventricular fibrillation,
fatal ? Over 4 amps heart paralysis severe
burns. Usually caused by gt600 volts
8
Fundamentals of Electrical Hazards
  • Hazards of Electricity
  • Electrocution/Shock/Burns/Death
  • Minimum distance from overhead lines 10 ft.
  • Inspect all electrical tools and equipment
  • Frayed, cut, broken wires
  • grounding prong missing
  • Improper use of cube taps
  • improperly applied or missing strain relief

9
Electrical Protection
  • Circuit Breakers
  • Provided to protect EQUIPMENT not people
  • Do not reset breakers with a line voltage higher
    than 120V and only reset if you know why it
    tripped
  • GFCIs
  • - Provided to protect people
  • - Trip range 4-6ma
  • - Monthly test

10
Electrical Protection
  • Distance
  • If you sense the presence of an electrical hazard
    or exposed conductors that may be energized, keep
    your distance and STAY AWAY

11
Terminology
12
Electrical Grounding
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17
Fundamentals of Electrical Hazards
  • Voltage
  • electrical pressure (water pressure)
  • Amperage
  • electrical flow rate (gallons/min)
  • Impedance
  • restriction to electrical flow (pipe friction)

18
Fundamentals of Electrical Hazards
  • Circuit
  • path of flow of electricity
  • Circuit Element
  • objects which are part of a circuit and
  • through which current flows.
  • Fault
  • current flow through an unintended path.

19
Fundamentals of Electrical Hazards
  • What is Grounding?
  • Protection from electric shock
  • normally a secondary protection measure
  • A ground is a conductive connection
  • between electrical circuit or equipment and earth
    or ground plane
  • creates a low resistance to the earth.

20
Basic Rules of Electrical Action
  • Electricity isnt live until current flows
  • Electrical current wont flow until there is a
    complete loop, out from and back to the power
    source.

21
Preventing Accidental Electrical Contact
Electrocution
Prevention
Path
Electricity
Keep Away
Ground
Time
GFCI
22
Dos and Don'ts
  • Do plug power equipment into wall receptacles
    with power switches in the Off position.
  • Do unplug electrical equipment by grasping the
    plug and pulling. Do not pull or jerk the cord to
    unplug the equipment.
  • Do not drape power cords over hot pipes,
    radiators or sharp objects.

23
Dos and Don'ts
  • Do check the receptacle for missing or damaged
    parts.
  • Do not plug equipment into defective receptacles.
  • Do check for frayed, cracked, or exposed wiring
    on equipment cords.

24
Dos and Don'ts
  • Do check for defective cords clamps at locations
    where the power cord enters the equipment or the
    attachment plug.
  • Extension cords should not be used in office
    areas. Generally, extension cords should be
    limited to use by maintenance personnel

25
Dos and Don'ts
  • Cheater plugs, extension cords with junction
    box receptacle ends or other jury-rigged
    equipment should not be used.

26
Dos and Don'ts
  • Consumer electrical equipment or appliances
    should not be used if not properly grounded.
    (Look for the UL Label)

27
Dos and Don'ts
  • Employees should know the location of electrical
    circuit breaker panels that control equipment and
    lighting in their respective areas. Circuits and
    equipment disconnects must be identified

28
Dos and Don'ts
  • Temporary or permanent storage of any materials
    must not be allowed within 3 feet of any
    electrical panel or electrical equipment.
  • Any electrical equipment causing shocks or with
    high leakage potential must be tagged with a
    Danger tag or equivalent.

29
Myths and Misconceptions
  • Electricity takes the path of least resistance.
  • Electricity wants to go to ground.
  • If an electric tools falls into a sink or tub of
    water, the item will short out.

30
Myths and Misconceptions
  • AC reverse polarity is not hazardous.
  • It takes high voltage to kill 120 volts is not
    dangerous.
  • Double insulated power tools are doubly safe and
    can be used in wet and damp locations.

31
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